Monomer reactivity ratios of cellulose grafted with N-cyclohexylacrylamide and methyl methacrylate by atom transfer radical polymerization

The atom transfer radical polymerization (ATRP) of N-cyclohexylacrylamide (NCA) with methyl methacrylate (MMA) was performed in dimethylformamide (DMF) at 130 °C, in the presence of cellulose chloroacetate (Cell.ClAc) macro initiator, Cu(I)Cl/2,2?-bipyridine catalytic system. The graft copolymers were characterized by elemental analysis, FT-IR spectra and thermal analysis. Thermal stabilities of the graft copolymers were determined by the TGA method and it was found that the thermal stability of the copolymers increased with the increase of MMA units, while it decreased with the increase of NCA units. In order to investigate the effect of NCA interactions with MMA monomers on grafting, graft copolymerization was also studied using different feed compositions, ranging from 0.15 to 0.85. The reactivity ratios of NCA and MMA by ATRP on cellulose were determined using the Finemann-Ross (F-R), inverted Finemann-Ross (inverted F-R), Yezrielev-Brokhina-Roskin (Y-B-R), Kelen-Tüdos (K-T) and extended Kelen-Tüdos (extended K-T) linearization methods. The reactive ratios of r1 and r2 were obtained to be 0.004-0.128 and 0.657-0.907, respectively; r 1.r2 of the graft copolymers on cellulose is close to zero

Characterization and monomer reactivity ratios of grafted cellulose with N-(4-nitrophenyl)acrylamide and methyl methacrylate by atom transfer radical polymerization

N-(4-nitrophenyl)acrylamide (4NPA) original monomer was synthesized and characterized by FT-IR, 1H and 13C NMR techniques. The atom transfer radical polymerization (ATRP) of 4NPA with methyl methacrylate (MMA) were performed in dimethylformamide (DMF) at 130 °C in the presence of cellulose chloroacetate (Cell.ClAc) macro initiator, Cu(I)Cl/2,2'-bipyridine catalytic system. The graft copolymers were characterized by elemental analysis, FT-IR spectra and thermal analysis. Thermal stabilities of the graft copolymers were determined by the TGA method and it was established that thermal stability of the copolymers increased with the increase of MMA units, while it decreased with the increase of 4NPA units. In order to investigate the effect of 4NPA with MMA monomer interactions on grafting, the graft copolymerization was also studied using different feed compositions, ranging from 0.15 to 0.85. The reactivity ratios of 4NPA and MMA by ATRP on cellulose were determined using the Finemann-Ross (F-R), inverted Finemann-Ross (inverted F-R), Yezrielev-Brokhina-Roskin (Y-B-R), Kelen-Tüdos (K-T) and extended Kelen-Tüdos (extended K-T) linearization methods. The reactive ratios of r1 and r2 were found to be 0.017-0.116 and 1.209-1.472, respectively. The graft copolymers on cellulose r1.r2 are close to zero

Grafting of some monomers onto cellulose by atom transfer radical polymerization. Electrical conductivity and thermal properties of resulting copolymers

The research team grafted N-cyclohexylacrylamide (NCHA), 4-vinylpyridine (4VP), diacetone acrylamide (DAAM) and diallylamine (DA) onto pulverized cellulose by atom transfer radical polymerization (ATRP). First, cellulose chloroacetate (Cell.ClAc) was prepared as a macroinitiator by reacting chloroacetyl chloride with primary alcoholic OH groups on powder cellulose, where CuCl and 2,2'-bipyridine were utilized as transition-metal compound and ligand, respectively. The graft copolymers were characterized by FT-IR, elemental and thermal analyses, as well as with regard to their electrical conductivity and optical parameters. The thermal stability of the graft copolymers was determined by the TGA method. The results indicated that all the grafting processes decreased the initial thermal stability of the cellulose. The electrical conductivity of the graft copolymers was measured as a function of temperature, and it was found that it increased with increasing temperature. This indicates that the studied copolymers exhibit semiconducting behavior. © 2018 Editura Academiei Romane. All rights reserved.FÜBAP-1795ACKNOWLEDGEMENT: The authors wish to thank the Fırat University Research Foundation for financial support of the project FÜBAP-1795